Edited ch03.asciidoc with Atlas code editor

ch03.asciidoc

@@ -679,7 +679,7 @@ The block contains 419 transactions and the 64th transaction listed (+0627052b..
 
 ==== Using Bitcoin Core's Programmatic Interface
 
-((("Bitcoin Core", "Bitcoin Core API", "using programmatic interface")))((("programmatic interface")))The +bitcoin-cli+ helper is very useful for exploring the Bitcoin Core API and testing functions. But the whole point of an application programming interface is to access functions programmatically. In this section we will demonstrate accessing Bitcoin Core from another program.
+((("Bitcoin Core", "Bitcoin Core API", "using programmatic interface")))((("programmatic interface", id="progint03")))The +bitcoin-cli+ helper is very useful for exploring the Bitcoin Core API and testing functions. But the whole point of an application programming interface is to access functions programmatically. In this section we will demonstrate accessing Bitcoin Core from another program.
 
 Bitcoin Core's API is a JSON-RPC interface. JSON stands for JavaScript Object Notation and it is a very convenient way to present data that both humans and programs can easily read. RPC stands for Remote Procedure Call, which means that we are calling procedures (functions) that are remote (on the Bitcoin Core node) via a network protocol. In this case, the network protocol is HTTP, or HTTPS (for encrypted connections).
 
@@ -755,7 +755,7 @@ $ python rpc_block.py
 ('Total value in block: ', Decimal('10322.07722534'))
 ----
 
-Our example code calculates the total value transacted in this block is 10,322.07722534 BTC (inclusive of the 25 BTC reward and 0.0909 BTC in fees). Compare that to the amount reported by a block explorer site, by searching for the block hash or height. Some block explorers report the total value excluding the reward and excluding the fees. See if you can spot the difference.((("", startref="BCapi03")))
+Our example code calculates the total value transacted in this block is 10,322.07722534 BTC (inclusive of the 25 BTC reward and 0.0909 BTC in fees). Compare that to the amount reported by a block explorer site, by searching for the block hash or height. Some block explorers report the total value excluding the reward and excluding the fees. See if you can spot the difference.((("", startref="BCapi03")))((("", startref="progint03")))
 
 [[alt_libraries]]
 === Alternative Clients, Libraries, and Toolkits